Ubuntu: New Firefox packages fix security vulnerability

Several memory issues in the browser engine were discovered. An attacker could exploit these to crash the browser or possibly run arbitrary code as the user invoking the program. It was discovered that Firefox did not properly verify the about:blank location elements when it was opened via window.open(). An attacker could exploit this to run arbitrary code with chrome privileges. It was discovered that Firefox did not properly handle <div> elements when processing a XUL tree. If a user were tricked into opening a malicious web page, an attacker could exploit this to crash the browser or possibly run arbitrary code as the user invoking the program. Marc Schoenefeld and Christoph Diehl discovered several problems when handling downloadable fonts. The new OTS font sanitizing library was added to mitigate these issues. Gregory Fleischer discovered that the Java LiveConnect script could be made to run in the wrong security context. An attacker could exploit this to read local files and run arbitrary code as the user invoking the program. Several problems were discovered in the JavaScript engine. If a user were tricked into opening a malicious web page, an attacker could exploit this to crash the browser or possibly run arbitrary code as the user invoking the program. Michal Zalewski discovered that Firefox did not always properly handle displaying pages from network or certificate errors. An attacker could exploit this to spoof the location bar, such as in a phishing attack. Yosuke Hasegawa and Masatoshi Kimura discovered that several character encodings would have some characters converted to angle brackets. An attacker could utilize this to perform cross-site scripting attacks. Updated packages are available from security.ubuntu.com.